Interior plaster wall



April 23, 1935.

E. RQBERTS INTERIOR PLASTER WALL F'iled Feb. 15, 1932 Patented Apr. 23,1935 UNITED STATES PATENT OFFICE mesne assignments, to Company, NewYork,

New Jersey United States Rubber N. Y., a corporation of ApplicationFebruary 13, 1932, Serial No. 592,689

10 Cla.ims.

This nVention relates to nteror plaster wa1l constructon and the methodsfor producing a more flexble interior plastic compositon and one Whichw1l net ha've the usua.l brttleness whch 5 invarably results in theformaton of a. number of smalloracks.

I-Ieretofore, it has been common practice so incorporate hair and otherfibrcius materia-15 in interor plaster wall compositions in an elort tobond. the material together and prevent cracking of the plaster Wal1.The use of such materia-1 results in an apparent increased toughness ofthe plaster composton end genera,lly prevents the plaster fromfallngafter it has cracked. However, no increased flexibility can beobtained by this mthod end although the plaster s prevented from fallngin largo pieces after it has oracked, the treatment With hair and otherfibrous materials in no way prevents the formaton of the cracksthemselves in the wall. Sometmes a fabric is applied to the wall surfaceand the fabric covered wa1l papered to prevent cracking. Varouschemicals have been used in plaster compostons in order to hasten thesettng end ncrease the hardness of the walls, but in none of ,thesemethods iS an ncreased flexibility produced nor any apprecable decreasein the teridency o the plaster wa1l to.crack. o 1 V Several embodimentsof the inventic'm are illustrated. in the accompanying drawng, in which:

Figure 1 illustrates a plaster wa1l over which paper or fabric isappled; and

Fig. 2 llustrates a, plascer wall over which a layer of paint s appled.

In carryng out my nventon,l apply che plaster wa,ll to a suitable base,Wth or without the addton of. har, or other fibrous material to theoompo3iton, n'a, manner well known in the art. While the wall is stillweb, or, f desired, after it has partly or wholly dried, I app1y byspraying, bru'shing, or spreading an aqueous dspersion of rubberto thewall or celing surface. The rubber materal may be natural latex or anartifical disperson of rubber or rubber-like material and may beunvulcanized, or pre-vulcanized, or mixed with compoundng ngredentsincludng well known ultra accelerators which will vuloanze the rubberdeposit from such dispersion ai; normal temperatures under atmosphericconditions. It is also desrable to dilute the dispersion to a viscositypermttng ready absorption into the surface of the plaster material, andin order to further aid in the penetration, I may add to the Iatexcompostion a. wettng or penetrating agent such as sulphonated. castoroi1; ortho toluidine, Nekal,

or other well known penetrating compositions. Where a Wall paper orsutable fabric is to be applied to the p1aster surface subsequent to thetratment wth che rubber composition, it isdesirable to use a, thn enoughdispers'on oi rubber so that it will penetrate into the interstices ofthe wall and not form a contiriuous film over the surfase. In this wa,y,after drying, a reinforcing end flexble web of rubber materal acting tobond the partcles o=f plaster together Will be formed in the nteror ofthe wall and after the paper or fabrc has been applied to the surface bythe usual adhesve materials such as fiour or starch pasfie and the like,the wall is still able to breathe through the paper or fabrc, as sdesira,ble in this type of construction. Such a struoture is ilustratedin Figure 1 where a plaster wall I that has been treated With an aqeousdisperson of rubber so that the disperson penetrated into the wall toform a reinforcing web in the nteror of the same is covered With a,layer 2 of paper or fabric material. However, where the wall is to besub-sequently painted. With a oontihuous film of pant, rather thanpapered, 11; is perhaps Vdesra.ble to apply che rubber dsperson so thata. coritnuous film of the same s formed on the surface of the wall.'Ihus in addition to the rubber penetretng into the plaster wall andformng a renforcng end fiexbe web of rubber in the nterior of the wallactng to bond the partcles together, a1continuous film of rubber s a.lsoformed on the surfaoe thereof; 'I'his continuous film When dred, inaddton ho ncreasing the fiexblcy of the wall, also forms an excellentadhesve base for the paint material applied to the finshed wa1l surfece. Such a structure is llustrated in Figure 2 where a plaster wall 3has been coated Wth a, contnuous film 4 of rubber deposted from'anequeous dispersion of rubber and the rubber film 4 covered. wth acontinuous layer of pant 5. In some cases t s desirable to apply acontnuous film of rubber dspersion to a wall thai; s to be covered Wthpaper or fabric end app1y such paper or fabrc to the wall surfacefreshly wected wth the continuous film of dspersion prior to dryng inorder to secure adhesion by a common' bond between the paper or fabricand the rubber in the interim of the wall through the continuous rubberfilm at the surface.

As a specific illustration of one manner of carry1ng out the nvention,without intention to 1imit 'the nvention except as 'requred by the prorart, the following example is included: Tu 9, plaster wall surfaceeither web, partially dry,

or dry, the following compositi0n ma.y be applied by sprayng, brushng,or by some other sutable manner.

Parts Latex (solds) 100 Penetratng agent 2 to 5 Glue 3 Ultraaccelera-tor 1 Zinc oxide 2 Sulphur 3 Anti-oxdanx'; 1

Latex s che ruboer disperson used as an 11111s tretion in the aboveexample, and should preferab1y heve a. solids content of from 18-25%,although it may, under certan crcumstanees, vary from 10-60% solidecontent. The Iatex may be of normel consistency, or dluted, orconcentrated as by evaporaton, creeming or centrifugng, end is preferabyalkelne wish a hydrogen on concentraton of epproximetey p-I 10 to 12,although the hydrogen ion concentraton mey vary wthin wider limite esrom a pH 01" 7 to 14. Other equeous dispersione of rubber, such 2.5araifical dispersione of crude or 1eclaimecl, rubber, G1 of rubbersubsttutes or synthete materiale rsesembling rubber may be and it s tobe understood that the termaqueous dispersione of rubber ncludes thesame. The wettng or penetraaing agent f ncuded, may be sulphonatedcestor 011, orho te ludne, Nekal, or other well known wettng me.-t-erials, and. the ultra acceleretor end. entkexcxant may be any of thewell known products now in gene1al use in the art. The rubber disperson,if desired, need. net eontain vueenzng ingredents. in whch case therubber depost in the plaster wa,1 w1 noi: be vulcanzed. The treatedpester wall s dred end paper or mbrc, or a pa:lnt surace eppled tner to.Wth a peint surface, t s desirable to vuoanze the depost appled io thewall in order to reduce to a min mum a.ny possible residuel tackiness ofthe painbecl surface. The term pester es used throughout the descrptonami claims is to be nterpreted broadly end in adcton to ordnary plasuersurfaeed wal'is inenced. to include stucco surfaces, eomposfcion plasterboard contenng plaster embedded 1e,ths faeed wth card board and plastercompostons eontenng har, oaher fibrous materiale, chem eals and thelike.

In view of the many changes end modificatons thai; may be made houadeperong from the prineples underlyng the nvention, reference should bemade to appenocl claims for an un.erstancng of the scope of the nvennon.

I-Ieving thus descn'bed my inventon, what I eam end desre to protect byLettere Patent is:

1. In a.n interim wal1 construction, a, surface comprsn plaster havng arenforcng end fiexible web of vuloanzed rubber actng to bind the plasterpartcles together.

2. In an interim wa1l construction, a surface comprising plaster havng areinforcing end 1exib1e web of the solide depost of an aqueousdispersion of rubber e,etng to bnd the plaster partcles together.

3. In an nterior wal1 construction, a surface comprislng a pla.steraggregate, che parteles 0f whch are bonded together ai: least in pari;by a renforcing end. flexble web of the solds depost of an aqueousdspersion of rubber, said rubber beng vulcanzed.

4. In an interior wa11 constructon, a, surface comprsing a, p1esteraggregate, tne particles of Whch are boncled together at least in pari:by a renforcng end fexble web ci che solide depost of an aquecusdispersion of rubber end a layer of paper or fabrc over sad. plaster.

5. In an interor wa11 constructon, a surface comprisng a plasteraggregate, t'ne partcles of which are bonded tog'ether at least in pari;by a reinforcing end fiexble web of ;the solide depost ci ero aqueousdispersio-n of rubber, end a contnuous 1ayer of rubber on seid surface.

6. The method of eonstruetng wal1 interim Whch eomprseg applyingp1e.ster to a sutabe base end appying an aqueous disperson of rub ber tesaid paster te form e renfcrcng end fiexible web of rubb-ef materelectng se bond the partces 0:" paster togethex, dryng end vusanzing sadrubber.

"1. The method of co'nstructing wa11 interim which eompises appyngplester no a, sutable base end sprayng an aqueous dsperson 01" rubbea:on sex-id pester te form e renforcng end flexble web of rubber meteralectng to bond the paric1es of plaster together.

e. The methoc o1" improvng the fiexo'lity end reducng the crackingtendency of plaster walls which comprises treatng seid walls wth anaqueous disperson ci rubber to forno a renforcng end flexble web 01rubber materal aeting te bond che partcles of paster together.

9. The method of constructing wall interim w" ch comprises applyngplaster te a sutable base, appyng an equeous dispersion cirubber to seidp1aster to form e, renforcng end fiexble web 0)? rubber materal actng tebond Che particles 0f p1ester together, end applying paper or febrc tosad treated. plaster.

10. The method of construccing wa1l nteror whch comprises applyng,plaster to a suitable base, end applyng an aqueous dsperson of rubber tosad plaster to form a renforcng end fiexble web of rubber meteral actingto boncl the partcles of plaster together.

ELMER RG'BERTS.

